/**
* jQuery.UI.iPad plugin
* Copyright (c) 2010 Stephen von Takach
* licensed under MIT.
* Date: 27/8/2010
*
* Project Home: 
* http://code.google.com/p/jquery-ui-for-ipad-and-iphone/
*/


$(function () {
    //
    // Extend jQuery feature detection
    //
    $.extend($.support, {
        touch: "ontouchend" in document
    });

    //
    // Hook up touch events
    //
    $.fn.addTouch = function () {
        if ($.support.touch) {
            document.addEventListener("touchstart", iPadTouchHandler, false);
            document.addEventListener("touchmove", iPadTouchHandler, false);
            document.addEventListener("touchend", iPadTouchHandler, false);
            document.addEventListener("touchcancel", iPadTouchHandler, false);
        }

        return this;
    }
});


var lastTap = null; 		// Holds last tapped element (so we can compare for double tap)
var tapValid = false; 		// Are we still in the .6 second window where a double tap can occur
var tapTimeout = null; 		// The timeout reference

function cancelTap() {
    tapValid = false;
}


var rightClickPending = false; // Is a right click still feasible
var rightClickEvent = null; 	// the original event
var holdTimeout = null; 		// timeout reference
var cancelMouseUp = false; 	// prevents a click from occuring as we want the context menu


function cancelHold() {
    if (rightClickPending) {
        window.clearTimeout(holdTimeout);
        rightClickPending = false;
        rightClickEvent = null;
    }
}

function startHold(event) {
    if (rightClickPending)
        return;

    rightClickPending = true; // We could be performing a right click
    rightClickEvent = (event.changedTouches)[0];
    holdTimeout = window.setTimeout("doRightClick();", 800);
}


function doRightClick() {
    rightClickPending = false;

    //
    // We need to mouse up (as we were down)
    //
    var first = rightClickEvent,
		simulatedEvent = document.createEvent("MouseEvent");
    simulatedEvent.initMouseEvent("mouseup", true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
			false, false, false, false, 0, null);
    first.target.dispatchEvent(simulatedEvent);

    //
    // emulate a right click
    //
    simulatedEvent = document.createEvent("MouseEvent");
    simulatedEvent.initMouseEvent("mousedown", true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
			false, false, false, false, 2, null);
    first.target.dispatchEvent(simulatedEvent);

    //
    // Show a context menu
    //
    simulatedEvent = document.createEvent("MouseEvent");
    simulatedEvent.initMouseEvent("contextmenu", true, true, window, 1, first.screenX + 50, first.screenY + 5, first.clientX + 50, first.clientY + 5,
                                  false, false, false, false, 2, null);
    first.target.dispatchEvent(simulatedEvent);


    //
    // Note:: I don't mouse up the right click here however feel free to add if required
    //


    cancelMouseUp = true;
    rightClickEvent = null; // Release memory
}


//
// mouse over event then mouse down
//
function iPadTouchStart(event) {
    var touches = event.changedTouches,
		first = touches[0],
		type = "mouseover",
		simulatedEvent = document.createEvent("MouseEvent");
    //
    // Mouse over first - I have live events attached on mouse over
    //
    simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
                            false, false, false, false, 0, null);
    first.target.dispatchEvent(simulatedEvent);

    type = "mousedown";
    simulatedEvent = document.createEvent("MouseEvent");

    simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
                            false, false, false, false, 0, null);
    first.target.dispatchEvent(simulatedEvent);


    if (!tapValid) {
        lastTap = first.target;
        tapValid = true;
        tapTimeout = window.setTimeout("cancelTap();", 600);
        startHold(event);
    }
    else {
        window.clearTimeout(tapTimeout);

        //
        // If a double tap is still a possibility and the elements are the same
        //	Then perform a double click
        //
        if (first.target == lastTap) {
            lastTap = null;
            tapValid = false;

            type = "click";
            simulatedEvent = document.createEvent("MouseEvent");

            simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
                         	false, false, false, false, 0/*left*/, null);
            first.target.dispatchEvent(simulatedEvent);

            type = "dblclick";
            simulatedEvent = document.createEvent("MouseEvent");

            simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
                         	false, false, false, false, 0/*left*/, null);
            first.target.dispatchEvent(simulatedEvent);
        }
        else {
            lastTap = first.target;
            tapValid = true;
            tapTimeout = window.setTimeout("cancelTap();", 600);
            startHold(event);
        }
    }
}

function iPadTouchHandler(event) {
    var type = "",
		button = 0; /*left*/

    if (event.touches.length > 1)
        return;

    switch (event.type) {
        case "touchstart":
            if ($(event.changedTouches[0].target).is("select")) {
                return;
            }
            iPadTouchStart(event); /*We need to trigger two events here to support one touch drag and drop*/
            event.preventDefault();
            return false;
            break;

        case "touchmove":
            cancelHold();
            type = "mousemove";
            event.preventDefault();
            break;

        case "touchend":
            if (cancelMouseUp) {
                cancelMouseUp = false;
                event.preventDefault();
                return false;
            }
            cancelHold();
            type = "mouseup";
            break;

        default:
            return;
    }

    var touches = event.changedTouches,
		first = touches[0],
		simulatedEvent = document.createEvent("MouseEvent");

    simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
                            false, false, false, false, button, null);

    first.target.dispatchEvent(simulatedEvent);

    if (type == "mouseup" && tapValid && first.target == lastTap) {	// This actually emulates the ipads default behaviour (which we prevented)
        simulatedEvent = document.createEvent("MouseEvent"); 	// This check avoids click being emulated on a double tap

        simulatedEvent.initMouseEvent("click", true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
                            false, false, false, false, button, null);

        first.target.dispatchEvent(simulatedEvent);
    }
}